package com.tom;

import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

/**
 * Servlet Filter implementation class CharacterEncodingFilter
 */

public class CharacterEncodingFilter implements Filter {

	String characterEncoding;
	boolean enabled;

	@Override
	public void init(FilterConfig fconfig) throws ServletException {

		characterEncoding = fconfig.getInitParameter("characterEncoding");

		enabled = "true".equalsIgnoreCase(characterEncoding.trim())
				|| "1".equalsIgnoreCase(characterEncoding.trim());
	}

	@Override
	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {

		if (enabled || characterEncoding != null) {
			request.setCharacterEncoding(characterEncoding);
			response.setCharacterEncoding(characterEncoding);
		}

		chain.doFilter(request, response);
	}

	@Override
	public void destroy() {
		characterEncoding = null;
	}
}

